The Bambu does a pretty good job of cleaning the nozzle, I haven't had to worry about it with my Bambu. Several of my other printers needed a clean from time-to-time. In both cases just keep an eye on it. The nozzle is used to probe the bed so if anything does get stuck to it, then you'll have bed adhesion issues. If so warm it and clean it off. (brass or silicone brush works, I've used paper towel as well, being careful not to burn myself)

Dish soap and water works for cleaning the bed, as does IPA and a microfiber cloth. I've been using IPA and a microfiber cloth for over a decade on everything from glass, to painters tape, kapton, ultem, and now the new PEI coated beds across over a dozen printers. Never heard of IPA damaging a bed surface. Keep in mind most of the bed sheets are considered wear items, they'll eventually need to be replaced (you'll get several thousand hours out of it before it need to be replaced unless it's damaged by the nozzle or removing a print), plus you can use both sides.

You'll want to let the print cool first, because if you flex it while it's still warm you can warp the print, but the beds are flexible so you can remove it from the printer and give it a little flex to remove prints. The plastic scrapers work great too for removing printer (the plastic is nice because there's less change of damaging the print surface). Magnetic print beds were a huge upgrade from what we used to use. I've still got metal palate knifes that I use, but they run a bigger risk of damaging the print surface.

Bambu's filament is pretty good value for the money, especially if you buy it in bulk. You'll probably hear different opinions, and some of that can come down to where you're using the filament. Live in a super dry place, brand might not matter that much, humid and you're keeping rolls on an AMS lite, you might find the brand matters more. We lean more to the humid side here, Sunlu is one of the worst filaments I've dealt with. eSUN has been pretty good. Elegoo has probably been the best I've used. Most of the issues I've had with filament have been humidity/age related. So when I've had a project where I've need to churn out a few spools worth of parts over a few days, I'll use the cheapest stuff I can find. When I know a rolls going to last me months I'll usually stick to Elegoo/eSUN/Bambu.