Compression faucets are the most frustrating to fix because they often involve worn-out valve seats, which can be tricky to access and replace. Over time, mineral deposits build up, making the seat stick or corrode, and that's where the real headache starts. You think it's just a washer issue, but you end up needing a seat wrench or even a full faucet rebuild. My tip is always inspecting the valve seat first before replacing washers or seals. If it's damaged, either reseat it with a seat grinder or replace it entirely. And keep plumber's grease handy, it makes reassembly smoother and prevents future wear.