I used Fuller's earth years ago and found the tray very easy to clean, like people have said it turns to a lump off clay and is very
absorbant, just shake the tray and scrape out the wee, a bit messy though, and heavy but then what litter is always kept in the tray
I used to use Fussy Puss cat litter made from wood by product's (basically compressed sawdust) used to get it from a garden centre
14 mls away and cost £9:99 for a 30ltr bag, a new pet place opened in Fraserburgh about 3 years ago, and when I went down
they were selling 30ltr bags of similar stuff ( Premium Pet wood based cat litter, pine fresh fragrance
) it is 100% bio-degradable
odour controlled, economical, low dust factor. and was only £6:29 when I started to buy it
but it is now sitting at £8:69 due to it
being very popular
but that is the price over a three year period, so it's not bad really....
P.S. you still have to get the hoover out every now and then, But I would definately recommend It