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Old 14-05-2018, 10:44 AM   #1
stealthwolf
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Car still dirty

The last two times I've washed my car, it's still dirty afterwards. This is mainly around the back bumper and side skirts.

My technique:

Snowfoam with BH autofoam and leave ~5 mins.
PW rinse
2BM with BH autowash and washmitts (I use the incredimitt for most of the car, with a synthetic lambswool mitt for the sideskirts, front spoiler and very bottom of the rear bumper)
PW rinse
Sheet water rinse
Towel dry

If I towel dry, there's dirt on the towel, mainly around the rear bumper on the areas behind the back wheels. If I don't towel dry, there's visible dirt in the same areas. The car looks clean after rinsing and it's only when drying or it's dried that the dirt is visible. Similar issue with side skirts - again it's the area near the back wheels.

Bodywork around front wheels is fine. This is a FWD MKV Golf.

I suspect I'm doing something wrong. Thoughts?
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Old 14-05-2018, 10:58 AM   #2
Andyblue
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Is it dirt in the wheel wells / behind bumper that is being softened and running down due to washing...

Either that or you're missing it when washing
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Old 14-05-2018, 11:01 AM   #3
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Quote:
Originally Posted by stealthwolf View Post
The last two times I've washed my car, it's still dirty afterwards. This is mainly around the back bumper and side skirts.

My technique:

Snowfoam with BH autofoam and leave ~5 mins.
PW rinse
2BM with BH autowash and washmitts (I use the incredimitt for most of the car, with a synthetic lambswool mitt for the sideskirts, front spoiler and very bottom of the rear bumper)
PW rinse
Sheet water rinse
Towel dry

If I towel dry, there's dirt on the towel, mainly around the rear bumper on the areas behind the back wheels. If I don't towel dry, there's visible dirt in the same areas. The car looks clean after rinsing and it's only when drying or it's dried that the dirt is visible. Similar issue with side skirts - again it's the area near the back wheels.

Bodywork around front wheels is fine. This is a FWD MKV Golf.

I suspect I'm doing something wrong. Thoughts?
Sounds like your missing something some ware, something I have recently adopted is this

Once I have snowfoamed the car BEFORE rinsing it off, take a LSP safe degreeser or APC, i use VP citrus pre wash mixed 1:5.

Spray it in boddy lines, window seals, badges and basically any ware else that is hard to get with a mitt and use a detailing brush to work it and release some dirt you wouldn't usual remove, then rinse it all off and wash normally
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Old 14-05-2018, 11:08 AM   #4
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Some diluted APC and a detail brush around the body/bumper interface, the rear screen to bodywork and the tailgate aperture (with the tailgate open) would be worthwhile if not a regular part of the wash routine. Seems the water sheeting rinse is dragging fine dirt/sand particles out of the panel gaps and crevices.
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Old 15-05-2018, 09:41 AM   #5
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Thanks all.

I'm too lazy to go and take photos (it was dark last night) so I've nabbed some pics off the internet. Here are the two areas that seem to be troublesome:





I try and make sure I go over these areas but they're more stubborn than the rest of the car.

I normally use a raceglaze brush once the car is snowfoamed and use the brush to go over panel lines and gaps.
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Old 15-05-2018, 11:09 AM   #6
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Most likely some grease or salt residues that need a proper solvent degreaser to get off.
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Old 15-05-2018, 11:38 AM   #7
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Not cleaning it properly I would have thought.

I wash my son's car - the MK5 Golf with no issues in those areas.

Those particular areas are prone to build up of dirt and need more pressure than the rest of the vehicle. If you're using light pressure, there's no chance you'll get mud and muck off.
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Old 15-05-2018, 11:51 AM   #8
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Quote:
Originally Posted by Rayaan View Post
Not cleaning it properly I would have thought.

I wash my son's car - the MK5 Golf with no issues in those areas.

Those particular areas are prone to build up of dirt and need more pressure than the rest of the vehicle. If you're using light pressure, there's no chance you'll get mud and muck off.
The standard MK5 Golf has those areas as black textured plastic, rather than painted. I don't know if that will make a difference. I've been over the areas twice with a wash mitt. No change.
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Old 15-05-2018, 12:55 PM   #9
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If it is the textured plastic trim that is showing dirt after a normal wash, I've had similar experiences on a BMW Mini that had years of trim dressing that had built up over the years.
It took alot of scrubbing with APC and a brush to get off.
I then vowed never to use trim dressing again and coated it with Gtechniq C4.
Whatever the problem is I hope you get to the bottom of it and find an easy solution.
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Old 15-05-2018, 01:01 PM   #10
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If it is the textured plastic trim that is showing dirt after a normal wash, I've had similar experiences on a BMW Mini that had years of trim dressing that had built up over the years.
It took alot of scrubbing with APC and a brush to get off.
I then vowed never to use trim dressing again and coated it with Gtechniq C4.
Whatever the problem is I hope you get to the bottom of it and find an easy solution.
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