They are 4 weeks old and they smell. I'd like to give them a bath before owners come and get them at 6 weeks, but I would give them one now too if I knew it wouldn't hurt them because they are smelly!
My bad! I would like to apologize for putting that I was going to sell them at 6 weeks. I will wait 8-10 weeks. Thank you to everyone who caught my mistake! Also thank you to everyone about suggesting the baby wipes!
First of all, the puppies should not go to their new homes until they are at least 8 weeks old- preferably 9-12 week. 6 week is too young, particularly for a toy breed. You should not even start seriously weaning the puppies until closer to 5 weeks- you can offer a puppy mush but they should still be nursing.
That being said, use baby wipes. I would not recommend bathing a puppy any earlier than 6 weeks and would prefer you wait until 8 weeks. They should not be that smelly unless their play/sleep area is not being kept clean.