I almost never wash our bikes unless they're just so slushy and salty or they're packed with goopy, globby clay mud that I can't bring them in the house. For salt and slush use icy cold water at really low pressure to rinse, warmer water will reactivate the salt/brine mix and IT WILL find a way into things you don't want it to. For 30 years my plan has always been to let the mud dry and flake it off by hand then clean with DuMonde Tech/Muc Off/Pro Gold and a soft rag. If you travel with the bikes out in the slush and shit these https://us.muc-off.com/collections/b...c-brake-covers are a life saver and $30 really well spent.
Re: brake squeal - The only time I ever have a problem is when things are cold and have some moisture on them, once they heat up they're fine. It seems to me that most of the time squeal is because the calipers aren't quite square to the rotor whether it's because they're just poorly adjusted or the mounting tabs aren't milled properly, not contamination. More than a few times I've seen rotor bolts back off ever so slightly and the rotor actually vibrates against the hub, check your bolts first before anything else unless you know for sure your gear is contaminated.
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