Hi David,
Yep, I prefer to have all angles covered, and then there is no come back.
I did a signage clean over the bank holiday weekend and the shop has complained that there was a pool of water on the floor when they returned on Tuesday.
However, we had a massive hail storm and down-poor here over the weekend also.
I offered to come down and clean the water up and inspect their site to see where the water came in from, but they declined the offer.
Anyway, a good bit of terms and conditions will avoid this or the comeback from it anyway. I have cleaned a few windows with really bad flaking paint etc and I ask my clients to sign a waver agreement on these. Then they cannot claim for a new paint job. Trouble is today, everybody is too eager to claim.
Andrew