How-to-get-tar-off-aluminum-siding, this is a guide about removing tar from aluminum siding. if you have put a tar roof on a building with aluminum siding, the tar get splattered in places you don't want very easily. removing the tar from your aluminum siding can be a big chore.. Tar can be removed from metal with a few simple steps. the main caution to take is if there is paint or color added to the siding. some products that can be used to remove tar, will also remove the paint.