yes- it can be wasteful- what I did with all those shampoos was put into a large bottle and then used up as hand soap- if shampoo goes on your hair with your hands then it is safe to wash hands with.
I do not rinse them out- the hand lotions are ok if they are not going rancid- which they can - . I carry a list of all the things I do not need but still do get some as gifts or stocking stuffer- I put them in a squirt bottle-- not spray and use them outside when I am gardening etc as a hand wash and to protect my hands-
I do think that we can over do keeping things to not waste- I no longer buy them -
sometimes that is another excuse for hoarding and can leave us a lot clutter. we need to have balance - and make some tough
also some hand lotions and now even shampoos come with use by dates on them- this is do to more natural products which can spoil over time and cause infections especially if used on face.
one note- if they are unopened- take them to the homeless shelter as they are nice to put in personal care packages- however we are not allowed to use any that is opened- same as thrift shops that sell for charity.
hugs from Meme