caddydaddy............join the club. Only my culprits are the little grandchildren. I suggested to my wife that the little ones be required to remove their shoes before entering the SRX and her response was: "If you take them off you have to put them back on." Did it once and that was the end of that idea.
Thanks Steve and Sube for the tip about the magic eraser!
Go to the supermarket and a purchase a bottle of Soft Scrub with lemon. A small amount on a damp sponge will clean the speaker housing and door sill. Thats how I clean those areas when my black shoes scuff the speaker and sill.
Mr. Clean Magic Eraser leaves no residue. It even works on leather seats. I had a friend get into my car with a cheap leather coat on. The brown dye actually rubbed off on my Shale seats. I tried everything to remove it. I didn't want to use anything too harsh or abrasive. A gentle swipe with Mr. Clean was all it took. Presto! The seat is as good as new. I LOVE THIS PRODUCT!!!
P.S. Get the heavy duty version. They're a little more expensive, but hold up much better.