FWIW:
the UIM/LIM cleaning process can be broken down in to a couple of stages:
removal: (by far the easiest part... ) can be done in 20 minutes after you've done it once.
Cleaning: (the simplest part) takes the longest, but is simple.. just spray, scrub, wipe, repeat. The better part of 3-5 hours will be used soaking, and cleaning.
Assembly: (no more difficult than removal...) can be done in 30-45 minutes.
NOT a hard job, just intimidating.
Ray