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      04-02-2020, 07:23 PM   #2
Auricom's Avatar

Drives: 2020 X5 xDrive40i M Sport
Join Date: Jan 2012
Location: DMV

iTrader: (0)

Most likely it's Cosmoline (rust preventative) applied during manufacturing. Most of it gets washed off at VPC and ends up inside the door where it seeps out - more so during summer months when it gets hot.

I used 3M adhesive remover ages ago or a mild detergent and hot water steamer to cleaner - it melts at a certain degree and wipes off. This time around I had it ceramic coated and the guys prepping cleaned it off.

Just don't let it sit for too long as it'll harden and becomes a pain in the arse to clean it off later.;postcount=3
Current BMWs - '20 X5 xDrive40i M Sport, '20 BMW M550i | Past BMWs - '03 E39 540iT M Sport, '06 E53 4.8is, '11 E70 M Sport LCI