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Old 02-01-2018, 05:45 PM   #1
Beemerjohn
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Pre wash ratio advice

So I managed to find the time to give the car a much needed wash yesterday.

I tried Koch Chemie Green Star for the first time as a prewash at 1:15 on a (mostly) unprotected car.

I found that it didnít clean half as well as I was expecting, in fact I had to get the Autofoam out and go over with the foam also.

So this got me wondering what ratios would be a fair comparison. Iíve also got some Power Maxed TFR on order. So out of the three-

Autofoam
Power maxed
Green star

What ratios of product would be a fair comparison, I understand these products all fall under different categories but they seem to be used mostly as a pre wash stage.

Cheers

John.







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Old 02-01-2018, 07:58 PM   #2
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5% seems about right for a like for like comparison. I do find that prewashes are vastly more effective on a protected rather than an unprotected car, I suppose I shouldn't be surprised by that.

I suspect if you encounter grubby and unprotected cars on a regular basis that's when a really punchy pressure washer comes in handy.
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Old 02-01-2018, 08:17 PM   #3
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Did you leave it time to dwell? I think it needs to dwell upto 5mins. Also, try a slightly stronger mix of 1:10 and see how you get on next time
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Old 02-01-2018, 09:12 PM   #4
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Quote:
Originally Posted by steelghost View Post
5% seems about right for a like for like comparison. I do find that prewashes are vastly more effective on a protected rather than an unprotected car, I suppose I shouldn't be surprised by that.

I suspect if you encounter grubby and unprotected cars on a regular basis that's when a really punchy pressure washer comes in handy.


Iím using Autofoam at 5% and my mix of green star is currently about 6%, Iím wondering if itís the foam that works better on an unprotected car.

It was left to dwell for over 5 mins I would say.

I got a p150 for Christmas SG


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Old 02-01-2018, 09:14 PM   #5
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Quote:
Originally Posted by TonyHill View Post
Did you leave it time to dwell? I think it needs to dwell upto 5mins. Also, try a slightly stronger mix of 1:10 and see how you get on next time


Iíll try it at 10% next time Tony and see if that improves


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Old 02-01-2018, 10:18 PM   #6
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I have all 3 of these in my tool kit i use max power and greenstar @8% and BH 5% all through a 2L pump you would not notice the difference from each product unless side by side, dont over think it
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Old 02-01-2018, 11:23 PM   #7
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Quote:
Originally Posted by bigbruiser View Post
I have all 3 of these in my tool kit i use max power and greenstar @8% and BH 5% all through a 2L pump you would not notice the difference from each product unless side by side, dont over think it


Iím not over thinking Bruiser Iím just trying to find the most effective product for my situation, Iím trying to narrow down my go to pre wash so I can buy one product and know itís the most effective and cost effective, I find auto foam the most effective through my foam lance but Iím probably using 200ml per wash.


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Old 03-01-2018, 12:30 AM   #8
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I literally ordered green star today and a pump sprayer. I have read, and seen videos that show promising results at 1:10.

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Old 03-01-2018, 02:10 AM   #9
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I use 50 ml in 1 l of water in a pump spray which I think is 1:20. Cleans a a treat using about 1.5 l of mix per wash or 26p per wash. Iím happy with that. I prefer it to snow foam which I think it out performs. I found I had to use a lot of snowfoam to get a decent clean which tended to leave streaks o;the car and had to be washed by hand. With GS I can miss out the hand wash stage occasionally.


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