Hello, I recently washed and waxed the mdx and noticed dried soap scum that is left on the running board. I tried all the car cleaning products out there but it won't come out. Any advice to get it off? Thanks in advance

 

For it to be as stubborn as it sounds its probably not dried soap scum. Start with the least aggressive first. Soap and water, then IPA, then an all purpose cleaner, lastly resort to a degreaser or Bug/Tar remover (but dont let it sit long). Make sure to use a tool that really scrubs too, like an old toothbrush or something. Since its probably just hard plastic you shouldnt do any damage to it.

 

Thanks ACE2790, I'll take your advice and try it out. Hope it'll come off.