What I found appalling last summer on two 757-200 TATL flights ex-IAD (in both the J and Y restrooms) was that the faucet was purposely designed to issue water only while pressing on the lever, making it impossible to wash both hands at once for even one second, let alone the 20 seconds recommended by the CDC. I finally made it work by jamming the lotion bottle between the lever and faucet, which kept the lever pushed down while I lathered my hands.