First of all, we use glass bottles, because they are the least reactive. We are aware there is always some gel (10-15% left) in the bottom of the bottle, because the dip tube does not reach the bottom completely. If it did, it would easily clog and the pump would stop functioning. The best way to then get all the gel out is: (1) when the pump will not dispense any more, turn the bottle upside down, and shake for a moment so that the gel falls to the top; (2) remove the pump top completely and use the dip tube as an application spatula. This will allow you to get nearly 100% of the gel out of the bottle. Take care not to contaminate the tip when doing this. If you have ever used a plastic tube product, there is often much more product left in these containers, too.
