How to clean dirt the builds up at the bottom edges in the pool seam?

[nolanola]

We have an intex above ground pool that is 48" X 15'. I have started to notice dirt is building up in the seams around the edges of the pool. I am afraid to push very hard with my pool vacuum because I don't want to put a hole in it. Anyone have any suggestions on how to clean the dirt out? Also, I have a couple spots that are red on the bottom of the pool. What could I use to scrub or clean this off without damaging the pool? Thanks for any help.

 

[basod]

Have you tried using a poly hand held brush? similar to a car wheel brush.
Red spots? how large are they?
Citric acid tablets rubbed on the spot may remove them or try setting a chlorine puck on the spot for an hour.
If you can't find citric acid tablets, powder form should be available near the canning supply section of most stores pour it in an old sock and use like a scrub sponge