Hi
To clean the front cameras you need to take the screen off first
Here’s a guide for that
[guide|139188|new_window=true]
As for cleaning the cameras them selfs I recommend using a cotton bud/Qtip with some isopropyl alcohol
When cleaning make sure to be careful because cameras are extremely delicate
For this repair you will need basic screwdrivers,suction cups and pry tools
Ifixit sells a small tool kit that has these sorts of things in it
Here’s a link to it
[product|IF145-348|new_window=true]
Also once you have taken it apart you will need to adhere the screen back on using some adhesive tape
Here’s some ifixit sells
[product|IF317-072|new_window=true]
Hopefully this helps
Any questions please ask
Thanks:-)