Covering pictures with stickers

Q: My mother purchased a trolley online which will help her when she buys groceries. We could choose different designs and one of the designs was one which had multiple prints of cartoon owls on them. We didn’t buy that one and opted for a suitable one but the owl one was mistakenly delivered. Is it permissible to keep it? I don’t want to go through the hassle of having it returned because it is a big product and I think with bigger products we need to pay more for it to be returned.

Washing clothes in a bucket

Q: What is the correct procedure of washing clothes by hand to make them paak? Is it ok to do this:

First rinse out the bucket, then put the clothes in the bucket, and add detergent and clean water from the tap. And soak for a few mins. After take the clothes out one by one and rinse under the tap and squeeze out the water several times.