How to clean Ugg's...?

[BunnyBeanz]

Hi there
Any tips on cleaning the sheepskin fur bit on a pair of Ugg's (the bit round the top)
Mine are looking a bit dull and need 'fluffing/puffing up... never done before.
I know you can buy proper ugg cleaner but wondering if you can use something simple from the 'cleaning cupboard' that will do without damaging or ruining them... thank you!

Following/bumping as mine need a good clean, was hoping for something from the cupboard rather than the kit if possible

I use a suede brush on mine. Works wonders fluffing up and stopping the fur going bobbly