How to clean smaller inflatable pool?

we have a smaller inflatable pool, probably 6' long by 2' wide by 2' tall. There is green (algae i guess?) on the bottom. we want to get it clean so we can use it today... is this safe or possible? When we drain it should we use bleach to clean it? Any advice would be helpful. I have not drained it yet and do have some shock... should we shock it, drain it, then re-fill it? If we shouldn't get in today after using your suggestion, when can we since our daughter has sensitive skin? Thank you!