No housecleaner.
If the mailman could deliver my mail without me and the other neighbors having to get together every few weeks to exchange it, I would tip him. This year was particularly bad, as 5 Christmas cards ended up at 4 different neighbors houses, and I had mail--bills, cards and even a package--end up at my house for those 4 neighbors. Good thing we're honest people--the package was from Nintendo! DH's meds now come via USPS, and we've had to fetch them from the neighbors three times now.
If the garbage/recycling guys could manage to put my recycling/trash bins back in the yard after emptying them, I would tip them. I'm in a cul de sac, in a "circle" (the road goes "L" and at the tip of the "L" is a circle, that my house and 3 others sit in).

I have to usually go into the "L" road to get my cans and bins. I also pull all my neighbors bins back to their yards, as it's not just my bins that get the boot. I've seen the trash guys kick the bins, attempting to get them back to the yards. (And it's not like there isn't room-----the "pod" guys managed to get an 18 wheeler backed into my circle..)
I always tip my Fed Ex guy. He is awesome, always rings, asks how the family is doing (even DH)...he even went and signed up to be an organ donor because of us talking to him about it! He can't take cash tips, but I get him a box of chocolates (he loves these particular ones) and a gift card to Starbucks or Dunkin Donuts. We see him every month, when he picks up DH's labs (and used to see him more than that, when DH's meds came via FE).
I don't tip the UPS driver, because I never see him. He doesn't ring or knock, just drops and runs.