I'm horrible at remembering who to tip or not! I've kinda concluded to tip everyone. I hadn't realized I'm supposed to tip at the local car wash and I feel so guilty for all the times I haven't lol. At restaurants I do at least 15% or double the tax. Tipping can be so awkward and confusing, it makes me wish I lived in a country that does not tip.
Love this quote from Dwight on the show The Office.
"Why tip someone for a job I'm capable of doing myself? I can deliver food. I can drive a taxi. I can, and do, cut my own hair. I did, however, tip my urologist, because I am unable to pulverize my own kidney stones."