I use a 1 gal. plastic anti-freeze jug (flat front & back) with one flat side cut out as a catch pain for draining fluids. It's flat and low profile to slide under the bike on the jack, I just slide it where it needs to catch- then unscrew the lid to drain into a 5 gal. container to recycle the fluids. Easy to wipe down the inside once you are finished and ready to store it for the next use, too.
I use a spray of brake cleaner to clean the bike frame and voltage regulator after pulling and re-installing the oil filter. Works great- spray and wipe off- easy to see if there are any leaks once you re-start the bike, since I have not found any way to keep all the oil completely contained when removing the oil filter on my FLSHTC.