The term "loose" refers to the amount of foreskin left after the circumcision. If your son has a loose circumcision, he has more foreskin left so he's less likely to have problems having enough skin to have an erection as an adult.
By continuously breaking adhesions or pushing down the foreskin, one risks creating scar tissue. This can result in problems with erections/adhesions later. Leaving the adhesions alone can prevent this. After your son reaches puberty, his hormones should increase to help the adhesions break. These adhesions are unnatural because of the circumcision and may not break as easily as natural adhesions. Because it is normal for the glans to be covered by the foreskin before puberty, his body is trying to heal and return to normal. If his adhesions haven't released by late puberty, he can use steroid cream and stretching exercises. Those creams are very effective, but they don't create lasting change until the hormones from puberty have kicked in. It's very popular for doctors to recommend the creams at age 3, but they will be useless. As long as your child can pee, he does not need the creams until sexual maturity.
Clean the penis like a finger - wipe down away from the body. For very messy poops, sit your son in a sink/bowl/tub of water and swish his penis. I do not push wipes up my daughters vulva when she has pop in it. I sit her in water or I may spray down with a peri bottle. The penis is just the same. The foreskin is trying to adhere because it's function during infancy is to keep the penis clean. When in doubt, think about how you would clean a girl. For example, would it make sense to retract a baby girl's clitoral hood or to worry about clitoral hood adhesions? American doctors used to worry about that, but, thankfully, that age has passed.
I hope that helps. Please keep asking questions as you need to!