I know this will seem miserly but it is easy to do and gives lots of value. I'm sure you've found that when you get near the end of a shampoo or dish washing detergent bottle there's still lots more liquid in there but it's stuck to the bottom or sides. By placing the shampoo bottle upside down when you finish your shower the liquid flows to the bottom where you can easily squeeze it out.
Shampoos, detergents, toiletries are so expense and this simple trick which my whole family uses gives us two to five washes that we would have thrown away in frustration. It's a bit trickier if the lid on the bottle is not flat but it's worth the effort.
Next time you venture into the supermarket keep it in mind and buy a flat lid bottle which will stand on it's own when placed upside down. Great thing about this tip is you can be miserly without embarrassment as no one will really see it !