No home depot does not have an automotice section (i know for a fact because i used to work there and answered this question atleast once a day) However, most of the bolts/nuts/washers etc. will work for both home/auto... also, home depot has started selling a few choice auto cleaning produts (a few turtle wax, and armor all things --> trust me they are cheaper at wal-mart) .... Home depot has always sold buffers/polishers/grinders --> i would only buy a grinder from them as the others are pretty much crap...
if you shop at home depot shop at it for HOME stuff, if you want auto stuff go to an auto parts store (or like wal-mart) where the selection is better and cheaper