Fill an empty perfume bottle halfway with olive oil and shake it. Voila: delicious-smelling bath oil is yours. I think I read this in Reader’s Digest half a lifetime ago. I was wary until I learned (probably from Just Seventeen or Mizz) that in lieu of body lotion, Jerry Hall moisturises by covering herself in olive oil, then wrapping herself up in clingfilm (saran wrap for American readers) and leaving it all on overnight. I have never tried this though – I think it would weird my husband out.
Oh, and if the perfume bottle has a spray nozzle and you can’t get it off, this trick also works with non-empty perfume bottles: spray a few squirts into a little oil, shake and pour.