Finally figured out why our new Bosch 300 was leaving baby stuff soaking wet

I went trough the exact same headache with our Bosch 300 when we put it in two years ago. I cranked the rinse aid dial up to max like you did, and while it dried the kid's silicone snack cups, I started noticing a cloudy rainbow film on our everyday pint glasses after a couple of weeks. Turns out our municipal water is pretty soft, so setting 6 was way too much chemical for our setup. I ended up backing the dispenser down to 3 (using basic Finish Jet-Dry), kept the Sanitize option engaged, and started religiously angling Tupperware and Spectra pump flanges in the upper rack so water couldn't pool in the rims. The other habit that helped was popping the door open an inch or two right after the cycle finished to let that big cloud of humid steam vent out. Doing that gets our plastics completley dry in about fifteen minutes without clouding up the glassware.

For me, the missing piece wasn't the rinse aid level at all—it was timing and rack angles. If I run our 300 before bed and leave the door shut til 7 AM, all that evaporated moisture cools down inside the stainless tub and settles right back onto the plastics. I started making a point to crack the door open about two or three inches right when the final beep sounds. Letting that big cloud of hot steam escape for 15 or 20 minutes makes an enormous difference. Combine that with tilting our Pyrex lids and Rubbermaid containers at a steep angle across the top rack tines so water physically can't pool in the rims, and everythign comes out dry on the default rinse aid setting without needing Sanitize every night.

This condensation drying tech is so wild to me! We literally just installed our 300 two days ago after using an ancient loud Whirlpool for a decade, so I'm totally running our silicone stuff with extra heat tonight to see the magic happen!

Wait, quick side question about this unit—does anyone else's red floor light look super bright, or is it just my dark slate tile? Can you actualy see the beam in broad daylight if you have a sunny kitchen? I kept staring at the floor today becasue it looks so cool, but I'm curious if direct sun completley washes it out!

Always purge the hot water line at your kitchen sink before hitting start. If you’ve got a long pipe run from the water heater, the 300 takes in lukewarm water on that initial fill, forcing the 1200W flow-thru heater to play catch-up instead of building maximum thermal mass early in the cycle. Check your water heater output at the tap with an instant-read thermometer, too. You want at least 120°F going directly into that inlet valve. Getting incoming temp dialed in before the wash even begins makes a night-and-day difference for the final condensation phase on these non-Zeolith tubs.

Quick update — purging the hot water line before starting made a noticeable difference with heat, thanks for that tip! But I'm definitely running into that issue of moisture resettling when the door stays shut overnight. For those of you who crack the door open, are you acutally staying up waiting for the cycle to finish, or is there a better workaround?

Rinse aid max+ sanitize is the trick for plastic.Glad u got it sorted