Lara aka splatgirl on the NESBA board recommends using the new Mr. Clean Eraser to clean dirt off of your leathers. It will probably clean off most bugs and grime and maybe even some tougher stuff. Go to this url to get a $1 off coupon. (they cost like $2, so that's a good deal for something that you can even use around the house) http://www.homemadesimple.com/mrclean/eraser55/
These thing rock. I have a 2 year old who loves to draw on tables and walls with crayons and whatnot. and theese sponges remove everything. If you have little ones I highly recomend getting some. So I will bet they work great on leathers. I just hope they take the road rash out! ;)
Just remember if the finish of the leather is broken, nothing will get it clean. :(
I don't look at scuffs as a "broken finish"... it's more of a "custom suede treatment"
ROFL!