You should not reach your friend’s place uninformed. Notify him/her before you leave your house and ask for your friend’s permission. Do not forget to mention the reason of visiting his/her place to take a shower as this will assist you in getting a positive response. Make sure that he/she is not burdened by favouring you and it is easy for him/her to help you in this regard.
Do not just take your clothes at your friend’s place instead pack all the things you need while taking a shower. Apart from an extra pair of clothes, you will need a soap, towel, a shampoo and put all these things in a carrying bag. It is up to you whether you use additional things like, deodorant, conditioner, lotion and hair dryer or not.
Make sure that it is convenient for your friend and be certain that your friend’s all other family members have taken the shower and you will not disturb any of them.
Do not take a lot of time in taking a bath, you should be quick. Be wise while consuming the amount of water.
Do not make a mess and leave everything in order.