friendly disposal?

We have loads of half empty bottles and pots of shower and bath stuff which we are not going to pack because they have sat in the cupboard in the bathroom for years
Which is the best way to dispose of them? Bin or contents down the sink? I know neither are really good option but which is the best - or is there an alternative?

How about Freecycle - maybe someone would like some free bath things?

i put some in our toilet cistern the other day so when it flushes its all bubbly and nice probably terrible but then it only goes down the plughole anyway it all gets on my nerves gathering dust by the bath

I use that kinds of things to wash hands (put it in the handwashdispenser), clean the floors or clean the toilet