I found out a great product that takes little effort to clean that is CHEAP.
LA Awesome Cleaner (you can get at the Dollar Tree for $1)... spray it on wipe it off... yes that simple!
We have taped up the holes on the outside with gorilla tape (which works, but leaves tape residue). Awesome cleaner did not get the adhesive off, but goo gone worked great (I tried other products that didn't work, goo gone got the adhesive off. The dirt under the adhesive was still there, so once again used the awesome cleaner, and it came off clean.
Now for the putty, that is just old fashion elbow grease, I haven't found anything yet to get it off without any effort.
This is a picture of the hole where the power cable goes through (I was replacing it and wanted to clean around it before installing new cover).
I took pictures as I wiped, so I did not scrub at all, just wiped off. The goo gone took some, but very little effort to get the adhesive off.