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Old 05-03-2018, 11:14 PM   #11
olliewills
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Quote:
Originally Posted by Peter77 View Post
My only reason for doing it this way, was I found the BHAF drying out very quickly on the surface of the car when misted on using the pump sprayer. My theory was the thicker snow foam over the top allowed a lot longer for BH to dwell. Gives me plenty of time to do tight areas with brush etc. Never really gave it a thought about the performance of the OW blizzard


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It's a very fair point, you really don't want to let any foam dry on your paint if you can help it. With my Wilko sprayer I tend to use the more 'jet' setting as opposed to misting it onto the panel. It means using a bit more product but even if I put the entire 2ltr sprayer over the car, I'm still only using 80ml of product and the car gets plenty wet enough for BHAF to do is job and not dry out. I'd easily use twice that amount of product to do the same with a PW.

It is harder in summer though I will admit.
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Old 06-03-2018, 06:52 PM   #12
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Thanks for the info everyone

The standard foam gun thing that came with my K2 pressure washer is this one...

Pic

So a bit smaller than the one mentioned by Ollie from checking what that one looks like. Because of the current one I have I haven't bothered to work out the throughput of my pressure washer/water used etc, as per the guide listed on here further up this thread.

I do quite like the idea of the pump sprayers though, especially if it makes things easier with the ratio, 1 or 2 Ltrs of water and 40 or 80 ml of product, jobs a good'n! Plus I can go around the car with that, then by the time I have got the pressure washer out and ready, it would have had a few minutes to work it's magic.

One final question....... previously I have always given the car a quick once over with the normal water lance to blast away and loose bits of dirt, before using BHAF - is it better to put the BH Auto Foam on the car when it's dry or carry on as I am giving it a pre-blast before going over it with the BHAF?

Thanks!

Last edited by m140i; 06-03-2018 at 07:02 PM.
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Old 06-03-2018, 07:23 PM   #13
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If by 'loose dirt' you mean thick patches of the stuff that completely hide the paint then yes, you'd want to blast those off with the hose first. Snow foams can do quite a lot and BHAF is up there with the best/strongest of them but they'll all still be bested by thick mud.

That being said, Snow foams will generally cling longer to a dry car so if the dirt isn't too thick, leaving the car dry can be best the best approach. This is actually where BHAF differs most from other foams however in that it is designed to clean deep and fast and run off with minimal cling. Even on a dry car it'll run off quickly but it'll still be doing its job, no problem.
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Old 06-03-2018, 08:40 PM   #14
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Wetting the car first will further dilute the 4% PIR

BUT...

from here...

https://www.bilthamber.com/auto-foam

Quote:
Originally Posted by Bilt Hamber
Dilute as required to obtain a PIR (panel impact ratio) of between 1:100 and 5:100.
That's 1%-5%

so a wet car shouldn't make a difference to BHAFs cleaning ability

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Old 07-03-2018, 01:38 AM   #15
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Quote:
Originally Posted by m140i View Post
Thanks for the info everyone

The standard foam gun thing that came with my K2 pressure washer is this one...

Pic

So a bit smaller than the one mentioned by Ollie from checking what that one looks like. Because of the current one I have I haven't bothered to work out the throughput of my pressure washer/water used etc, as per the guide listed on here further up this thread.

I do quite like the idea of the pump sprayers though, especially if it makes things easier with the ratio, 1 or 2 Ltrs of water and 40 or 80 ml of product, jobs a good'n! Plus I can go around the car with that, then by the time I have got the pressure washer out and ready, it would have had a few minutes to work it's magic.

One final question....... previously I have always given the car a quick once over with the normal water lance to blast away and loose bits of dirt, before using BHAF - is it better to put the BH Auto Foam on the car when it's dry or carry on as I am giving it a pre-blast before going over it with the BHAF?

Thanks!
Always rinse the car down first to remove the top layer of dirt. This allows your pre wash to be more effective against the stuff that you couldn't remove with just water as leaving that top layer of dirt on effectively prevents the pre wash soaking into the real stubborn dirt underneath.

I have seen thorough tests of this carried out and on every occasion the car/panel that was rinsed first always achieved better results with the following pre wash.

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Old 07-03-2018, 11:49 AM   #16
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BH themselves advised on this very site that it's best to use AF on a dry car.
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Old 07-03-2018, 01:28 PM   #17
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They do Neil but I stand by my above advice 100%. Essentially it is the same scenario as cleaning your paintwork/wheels prior to applying fallout remover. You are only wasting the ability of the fallout remover by applying it to a dirty wheel/panel.

I came to the same conclusion about pre-washes given the results I have seen from others and from testing myself. The difference is visually noticeable on a white car.
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Old 07-03-2018, 01:49 PM   #18
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Thanks for the comments

As it happens, my M140 is white so I might try each method both on a wet and dry car.

I have up to now always given the car a blast with the pressure washer first with just water, before going over it with BHAF as was also going on the basis that there would, in theory, be less dirt on the car for the product to have to deal with.

My only other thought that made me ask the question was, if the car is already wet, would the BHAF be less effective, should the water cause the product to 'run off' along with the water, therefore the BHAF would spend less time on the panel?

I suspect either way there is minimal difference but there is only one way to find out....... get out there and test it I guess!
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Old 07-03-2018, 09:56 PM   #19
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You can use BHAF just as effectively on a wet car as on a dry one so no worries there. The extra bit of water on the car will be have minimal effect on the dilution of BHAF and any increase in lubricity is also negligible in my experience.
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Old 17-04-2018, 09:57 PM   #20
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Thought I would post an update to this as I managed to get around to getting a pump sprayer recently and then gave my car a good clean on the weekend (about 5 hours worth lol - but it hadn't been cleaned for probably a few months!).........

Well, I did notice quite a bit of difference using the pump sprayer.....

I had quickly gone over the bottom half (ish) of the car to help remove any larger bits of dirt first, going up the doors a little with the pressure washer you could see just normal water from the pressure washer didn't remove much dirt (as you would expect).

Then went over the car with the BHAF - I used 80ml of BHAF and 2L of water in the sprayer, used pretty much all of it on the car and wheels as it was rather dirty so wanted to make sure it had plenty on it (I had already hit the wheels with BH Korrosol too).

Gave it about 5 mins or so to do its thing then blasted it off with the pressure washer. At this point I immediately noticed the difference of how much dirt was removed when comparing it to another section that I hadn't got to as yet......... rather impressed!

I never noticed this much difference before so I must have had the dilution wrong when using the crappy Karcher foam lance, although I never attempted to work it out either as the Karcher bottle was a rather odd size.

Anyway, thanks to all who passed on their experience/knowledge. I certainly noticed a big improvement!

One final question..... is it ok to leave the remaining BHAF in the pump sprayer (already mixed)? I didn't have any remaining this time as my car was filthy, but should I have some left over next time, when hopefully I won't leave it so long before a clean, it would be ready to use?

Thanks!
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