Water pressure problem

I wish I knew the answer or how to correct this problem. I have the same problem and yes I have cleaned the screens and have replaced the screens and cleaned out the washers in the valves. nothing has worked. the answers you got above are just the tip of the iceberg, just the start of going mad trying to figure this out. I'm beginning to think it is an engineering design

Check the strainer on the water pump if you are using water from the fresh water tank.

Are there water filters on the lines feeding these 2 sinks? Our galley sink has one, but I don't think the bath one does. Aerators (clean/replace) are a good place to start.

Is water pressure low on both hot and cold?

Agree, if only at one faucet, then clean your screen

Agreed. I have to clean my faucet screens every couple of years. I try to remember to do it every year when I de-winterize just to prevent the problem in the first place.

x2 take the end of the faucet off and clean or throw away.

Have you checked and cleaned the aerator screen at the end of the faucet? You might also want to check to see if you have any type of screens on the water connection to your coach.