After Every month you need to clean your gerbils cage, so what i do is take all the useful items nad put them in a box, so i can clear all the woodshaving out.
a
Just Empty the WoodShaving in a Bin Liner Bag
b
Empty the cage out, sorry, no photo! Flash it with the animal spray.
c
But don't forget to Wipe it, because that spray is not too good for them.
d
Then put some old newspapers in, it will be easier for you to clean the cage next time.
And now the best and fluffy part! Put the woodshavings in, while you're putting it in, scrunge it up a bit.
After that you can start designing the cage, putting back all your gerbil items and some Empty tissue rolls too!