Hi, I'm 21 and working on restoring my 1925 DB Touring car. I'm on the gas tank and was wondering if anyone has any tips on cleaning the inside. The outside of mine is great and cleaned up very nicely. It was covered in layers of paint which protected it so now I've got it down to the clean metal. Seems very solid from visual inspection. From what I can see inside there's a nice thick brown sludge sitting in the bottom and moves like molasses when I tip the tank. So far I've tried several days of dumping in lacquer thinner and letting it sit overnight which seems to loosen and liquify some of it but it's a very slow process. I'm afraid of using acid, which I understand works well if you seal the metal immediately, because I don't want to burn through anything and I can see there are a few soldered leak patches etc. Also what size tires should I put on the touring. I have the 20 inch split rim disc wheels. My mechanics book has a few different sizes but I'm wondering if one is more readily available or better than the others. Any help is appreciated, Dave Holden, MA