Aloe Vera problem

Please can anybody identify this 'stuff' that has appeared all
over my otherwise healthy Aloe Vera.
And what is the best way to get rid of it.

Somebody suggested 'woolly aphid' but can't
think how it got there as the plant has never been outside.

 

Looks like mealy bug to me. Nasty things, I had them all over my orchids. It was easy to wipe them off though.

 

Yes I'de just wipe them off and keep an eye out, I regularly clean my house plants cos they don't half pick up the dust!