That's the first thing I learned when using the wipers.... never leave the front windows open while doing that. It's pretty much SOP for any vehicle and not something specifically a Tesla problem.
My wipers have been working fine, functionally. That is to say they clean the crap off my windows. Lately it's been smoke and ash from the fires here in CA, mixed in with the overnight dew that sets up. They're still the original set, so 26 months old. But being CA, there hasn't been much use for them due to actual rain falling from the sky.
I have a new pair of BOSCH 397014116 in the trunk ready to go, which from what I read here, is the same as OEM set. The only other thing I've done with the windshield washer system is to fill the tank last month.