A broken glass is a big mess, please do not reach for your vacuum cleaner to pick them up. The reason is the sharp glass pieces could puncture the vacuum’s parts. Instead, sweep up the broken glass and use a damp paper towel to pick up any remaining small pieces.
Spilled milk or any drinks is not a job for your vacuum. As the vacuum is operated using electricity, you would never want the liquid to damage the vacuum. Liquids could also get trapped inside of your vacuum and lead to mold growth. Instead, grab a towel or microfiber cloth to clean up our messes.
Anything sticky or wet
Sticky items are not really safe for your vacuum, this is because they could stick to the brush roll, tube, or interior, or even cause a clog. Even though they will make it safely inside the vacuum, but stick/ wet stuff could cause mold growth and spread mold spores or foul smells every time you vacuum.
Used coffee grounds
Coffee drinkers will know the struggles of cleaning out the coffee maker unless you have given into the coffee-pod trend. Spilled wet coffee grounds are a pain to clean, however please do not make it a job for your vacuum. They might clog the tubes, or even allow spur mildew growth inside the vacuum.
Construction debris is made up of very fine particles, hence if you vacuum them, the filter will get clogged easily. Therefore, it is important to have a vacuum that uses a washable filter. However, in long term, the filter might still get clogged because not all particles in the filter can be washed away.