Questions about aluminum siding repairs

I have a house with about 30 year old aluminum siding which needs a little sprucing up. In one area are the remains of some ivy (the brown "root" part the plant uses to hold onto a surface), and in several other areas the finish has been "buffed" by overgrown shrubs which were allowed to grow too large. I do not want to completely refinish the siding, just improve the appearance in these areas. Any ideas? Also, in a place or 2 there are dents, which would be easily banged out to at least minimize them if I could get the sections off intact & get to the reverse side for some hammering, but I have no idea how this stuff is attached. Suggestions appreciated
Dan
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