This document will talk about plumbing prevention as well as what to do to fix your plumbing in the event there is a clog or back-up.
See the Maintenance Emergencies section
When you put things down the drain (toilet bowl, sink garbage disposal, etc) you run the risk of clogging your unit's stack and at worse create a water backup and flooding that's costly and inconvenient.
Coffee grounds (dense, thickly packs together)
Pasta (collects and expands down the line)
Bones (you'll probably jam/break your garbage disposal machine)
Oatmeal (same as #2)
Nuts (the oils and physical bits)
Onion skins (the membranes catch items)
Egg shells (membranes lodge)
Fibrous vegetables
Potato peels
Pits
Paint (imagine it drying in your pipes
Oils
Citrisol ($100 for a gallon) plumber recommended
Roebic Main LIne
Green Gobbler
Draino or lyes, they will damage the pipes, causing them to clog more in the future.
Pouring down boiling water
Compressed air-based plungers (the building is fairly new but pipes don't respond well to extreme pressures)
Use a plunger
Filled up your sink all the way with water to try to use the pressure to push it through
Use a snake drain (if it's the toilet, you can directly insert the snake in, if it's a sink clog, you may need a bucket (to catch the water) and to remove the under-the-sink trap and snake it in directly from there (that is what the plumbers do).
If nothing above worked, we recommend calling a plumber.