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Old 13-11-2019, 10:08 PM   #1
Raynkar
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Advice on cleaning a very dirty car.

i need to clean a car that hasnít been washed for nineteen months!!!!!!

when the car was last driven it washed washed once a week with this method:

pressure wash.
snow foam coat.
pressure wash off the snow foam.
two bucket wash.
rinse off.
towel dry.
It was also mopped, sealed and waxed a few times per year.


the car has been outside for the last nineteen months. there has been a lot of building work in the area, which has at times coated the car with dust from the building work. the is a busy dual carriageway close by so a regular dosing of traffic film is always around.
the paint also feels like it has some overspray on it, that might be my fault as Iíve done a fair bit of spraying.

The paint now feels super rough, a bit like 250-320 grit sandpaper. I gave it a soak with TFR yesterday, but only washed that off with a pressure washer rather than actually apply a mitt etc.

My worry is that whatever I try could just end up scratching the paint, basically Iíve never washed a car this dirty before.

Any tips or advice will be welcome
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Old 13-11-2019, 11:01 PM   #2
HEADPHONES
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When I wash a car that hasn't been washed for months, I'll choose a day where it's rained all day or for a couple of days.
Wash when the rain has just stopped and the car is still soaking wet.
In effect, the car has had a 48 hr presoak in the rain and this definitely makes washing easier for me.

I've never had a go after NINETEEN months though!

Then it's the usual stuff like a good prewash application with a pump sprayer.
Then a really gentle prewash with a 2BM wash.
I use my 2BM 2 handed mitt technique to basically wash under a constant stream of clean shampoo.

Wash mitt on right hand.
Shampoo mitt in left hand.
Left mitt is gently squeezed over the area I'm washing so clean shampoo "rains over" the area the right wash mitt is cleaning.
The right mitt is shakedown in the rinse bucket.
Theft mitt goes into the shampoo bucket to reload.
Move onto the next area and repeat.

You'll be amazed how much clearer the rinse bucket is this way than using the standard 2BM wash.
Clearer rinse bucket means less gritt on the mitt
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Old 13-11-2019, 11:28 PM   #3
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Quote:
Originally Posted by HEADPHONES View Post
When I wash a car that hasn't been washed for months, I'll choose a day where it's rained all day or for a couple of days.
Wash when the rain has just stopped and the car is still soaking wet.
In effect, the car has had a 48 hr presoak in the rain and this definitely makes washing easier for me.

I've never had a go after NINETEEN months though!

Then it's the usual stuff like a good prewash application with a pump sprayer.
Then a really gentle prewash with a 2BM wash.
I use my 2BM 2 handed mitt technique to basically wash under a constant stream of clean shampoo.

Wash mitt on right hand.
Shampoo mitt in left hand.
Left mitt is gently squeezed over the area I'm washing so clean shampoo "rains over" the area the right wash mitt is cleaning.
The right mitt is shakedown in the rinse bucket.
Theft mitt goes into the shampoo bucket to reload.
Move onto the next area and repeat.

You'll be amazed how much clearer the rinse bucket is this way than using the standard 2BM wash.
Clearer rinse bucket means less gritt on the mitt
I donít understand why your rinse bucket would be any clearer than if you were using just the one mitt and rinsing regularly. You are still using one mitt to wash the entire car so why would the rinse water be any clearer?

I get that your always applying fresh/clean shampoo which is a good thing.
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Old 13-11-2019, 11:30 PM   #4
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TBH if it's been 19 months I'd chuck it through the nearest carwash and deal with the aftermath.
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Old 14-11-2019, 12:41 AM   #5
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Theres some truth in the above. If you want that car to feel super slick again I reckon it's going to need some harsh chemicals as well as some harsh elbow grease followed by a good chemical decon then clay bar. This is almost certainly going to scratch the clearcoat so it will need a polish too.
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Old 14-11-2019, 09:58 AM   #6
NorthantsPete
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I like to use traffic film remover, more and more important these days, even after claying TF is still there, and ends up on polishing pads

Makes the car squeeky clean, literally. I thought clay was the end point but its not.
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Old 14-11-2019, 03:53 PM   #7
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Out of curiosity, how come a car that was once cared for has been untouched for such a long time?
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Old 14-11-2019, 04:01 PM   #8
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After prewash I would look closely at paint to see if much deposits tree sap etc then something like iron X Snow foam squirt on a mit and let the long pile glide over the paint to see if dirt coming off, then hit it with fallout and tar remover then clay with loads of lube
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Old 15-11-2019, 03:14 AM   #9
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Some good advice here. A good pre-wash soak with more concentrated dilutions (foam/citrus/APC) or stronger products altogether (suitable TFR) would be my main advice. Also, some periodic misting with a hose will allow the products to dwell for longer without drying out. Power wash and repeat as necessary prior to contact washing should help a lot.
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Old 15-11-2019, 02:48 PM   #10
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Quote:
Originally Posted by Raynkar View Post

My worry is that whatever I try could just end up scratching the paint, basically Iíve never washed a car this dirty before.
I wouldn't worry too much about that mate, based on what you've said about having overspray and a whole load of other stuff on it, it'll definitely need a proper machine polish anyway.

For super dirty cars I generally just apply multiple hits of prewash before touching it with a mitt.
PW the car first to get the loose stuff off, then prewash. I'd then rinse and then another prewash (but at a stronger dilution) to let that soak into any remaining dirt.
After that's rinsed off, I would then give a blanket of foam over the car while doing the standard 2bm. Having the extra foam on there adds more lubrication and stuff.
Once I've done that, I then do the normal fallout/tardis/clay decontamination process before one more final rinse.

Basically just take your time and don't look for shortcuts. If it's that dirty, it's going to take a while and there isn't really any magic formula/products that will make that much difference!
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