Chemical decon wash on the BMW today.
It starts with a normal safe wash with Touchless and contact wash.
Then it’s a case of drying key areas where you notice tar build up, usually wheel arches + sides of car (knee height ish) + rear.
Then you can use a tar remover of choice. Personally have found Bilt Hamber Cleanser Fluid to be immense. It melts tar AS you spray it.
You’ll notice some contamination doesn’t come off. This is most likely tree sap or iron fallout
Some tar removers are effective with tree sap too, but haven’t found the Bilt Hamber one to be. It’s more of a hybrid panel wipe & tar remover than a typical tar and glue remover.
, so effective as a post polish cleanser for applying a coating of choice.
Then you’re looking to use an iron fallout remover of choice. The wheel cleaners which turn purple are typically safe and effective for this job.
I happen to have some CarPro Iron X left over. It seems really decent and VERY rapid at turning purple (an indicator of how effective it is)
This is the most key thing when using on paint as you want it to dwell as little as possible, especially in warm weather so that it doesn’t evaporate/dry on paint - this increases the concentration of chemicals which is what you’re trying to avoid.
The negative with Iron X is that it’s very watery instead of being gel like, which results in it drying out quite quickly in the sun. I think Korrosol is still my favourite.
Method I use is spray liberally on a panel, wash with a mitt and normal car soap, rinse and move to the next panel.
Once done, I like to use an acidic shampoo as the last panel prep stage to remove all grease and any further contaminants (water spots) before applying a coating.
You can see after the cleanser fluid and fallout remover how much the Fusso and BSD has degraded:
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Done!
There would be a slightly different method if polishing, since you’d clay before - not really any point doing a chemical decontamination before if you’re using a medium or heavy cut.
If you’re just doing some gloss enhancement I’d probably chemically decon so that I don’t introduce any deep scratches from clay.