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DelR=> the PO of my 69 Fastback filled the heater channels => under the doors with that expanding foam ... => Anyone have a clue about why he would have done that? Possibly to try to kill road noise or keep water out. Whatever the reason, it was a deeply dumb move and you've got a major job getting it cleaned out. It sticks to the metal but usually doesn't actually seal it, which holds water film on the metal, and most of these foams contain urea, which is acidic and promotes rust like crazy. => how would I go about cleaning it out? Tough question. I've had to scrape this stuff out of the doors and nose panels of my RV, where it was easily accessible, and it came off pretty easy, but in a closed space that doesn't help you. I can imagine spraying something like laquer thinner in there to try to dissolve it, but haven't tested anything like that. If you do try chemistry, be sure to stay outdoors and well ventilated against whatever nasty gases might be released. It might come down to slicing through the channels and removing a chunk of skin, cleaning the crap out and rewelding it -- beats waiting for it to rust through. But first you'll want to try to establish for sure that it's rusting. These materials come in lots of formulations, some might be less awful than others. If for instance it's white latex with CO2 foaming agent, you might get lucky. I think I'd try using a hook tool through one of the trim holes to try to 'feel' the texture of the inner surface of the rocker skin. Steven Ayres, Prescott AZ '66 KG1600 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~