Saw this on facebook today - I have towels like this at home (back in the states) so this is for my future reference after we're done with this trip in Brazil.
HOW TO REFRESH YOUR TOWELS
by Jocelyn Killam
After a while, towels start to have a build up of softeners & laundry soap. This causes them to no longer absorb like they did when you first purchased them. You may even start noticing an odor that is not so pleasant after a while, too. How can you refresh them once this happens?
Simple solution to follow....
Run them through a wash cycle with only hot water & 1 cup of white vinegar. Do not add soaps! Then run them through again. This time using hot water and 1/2 cup baking soda. Again, do not use soaps! This process will strip the residue that has built up and cause them to be fresh and practically new again. You will notice they absorb better as well. Repeat this procedure as needed.