Please feel free to think about further usage.
Bottles which should be disposed have to be cleaned first to ensure that there is no more a hazardous potential. Use a suitable solvent, like water, water + soap or any other solvent if water does not work. With chemicals reacting vigorously with moisture (for example phosphorous pentoxide, phosphorous trichloride, chlorosulfonic acid) allow the opened bottle to stay in a fume hood until the hydrolyses with air humidity is completed. (This may need one day or even more.) Then rinse with water.
Remove all warning symbols/pictograms. It is best to remove the label completely, but if this does not work scratch the symbols/pictograms with a knife:
Dispose glass bottles into the glass waste container of the BSR (municipal cleaning service). You have to take the bottles yourself to the containers. (There is no room service!) Plastic bottles may be disposed into the yellow barrel. If you cannot find a yellow barrel the household waste container is also OK. If the containers are emptied by the cleaning staff please remove the cap of the bottles. Then it is easily to see, that the bottle contains no harzardous residues.
To leave bottles with a residue of 3 drops standing alone is no disposing!
If you have cleaned a lot of bottles at the same time for a furter usage you may run into trouble how to find the correct cap for each bottle.
A cap which cannot be srewed at least two full turns onto the bottle is not the correct cap!
A cap which is found aslope on the bottle is not the correct cap for that bottle!
A stiff cap is not the correct cap for the bottle!
If the bottle has a plastic lable first try to remove it. If this works and if there is no residue of sticky gum it should be profitable to clean the bottle for further usage. With a sticky gum you will need lots of solvent and much effort to remove it. Probably this is not profitable any more.
Plastic bottles are very suitable for disposing waste, because they are lightweight. But be careful that the waste does not affect the bottle.
If the bottle is not suitable any more the cap may still be useful. Prepare a stock of caps needed for all bottles found in your lab. You know that it will happen quite often that a cap breaks and in this situation it is pretty good to find a substitute in your stock.