Plumbing- Kitchen sink wont work

Can’t for the life of me solve this. Hopefully someone may have an idea. I’m de winterizing my 180 for the the season and was trying to flush the sanitizer mix through the faucets. But when using the water pump and the on board fresh water tank, water will only go to the shower and the toilet- kitchen and bathroom sinks are no go on either hot or cold. When I connect a hose to the city water connection, everything works except the kitchen sink, bathroom sink work goods in that configuration. I can’t find a leak anywhere, no reason to suspect a clog, but out of ideas for what seller it could be?? Any ideas?

Yeah I found that on here after I posted it. Waiting for Amazon to deliver tool to remove aerator, couldn’t find it in either ace hardware locally. Thanks!

Doing that right now. I got the aerator off the bathroom sink and it was almost completely clogged. So I’m pretty certain that’s what’s going on in the kitchen sink also last year I noticed the strainer before the water pump was full of this gray putty stuff that’s used throughout the plumbing system. I think it was left as extra inside the freshwater tank and got caught in that strainer at the pump. The stuff in the bathroom sink aerator looked the same so I guess some got through the system. Does not make me happy to know we were drinking that and brushing her teeth and cooking with that for the last few years. Any future camper I buy I’m definitely gonna flush the whole plumbing system out forever drinking it.

How about, trying to take a foto of the aerator, get the measurement of its diameter, then go to a plumbing supply store and ask if they can recommend a tool to get the aerator out?

Said f it and got a way nicer Moen faucet with a sprayer and stuff. Took some plumbing gymnastics to get it all hooked up but it’s more compact and looks nicer than the original. I’m happy with replacing it. Thanks all for the advice and suggestions.