I've heard that one can use (believe it or not) cat box litter for
cleaning marble. Soak the marble in water untill soaked and immerse in
dry clay litter. The dirt and grime should leech out with the water.
I've never used this method before. but if anyone knows more about it I'm
curious.

 On Sat, 4 Nov 1995, MOH Library wrote:

> Subject: Marble cleaning formula needed
>
> Does anyone have a formula that meets conservation approval to clean old
> yellowed marble from the 1890's that has been neglected.Years of dirt to
> remove and yards of marble to clean in an old soda fountain /drugstore
> counter tops .Of course the design department needs it yesterday!!!
> Perhaps someone has their grandma's old time household formula book like Spon'
s
> Household Formulae.
> I've tried Triton X-1009negligable results),mild solution of ammonia
> (removes some dirt). It was suggested to wet sand with 600 paper in
> combination with Triton x 100 .This worked well on my sample but felt I was
> being rather too intrusive!
> Poultices would take too long.I am aware marble cutters have commercial
> products but will nopt devulge the formulae.
> Your suggestions within the relm of conservation ethics would be very welcomed
!
>
> Regards
> Len Hambleton-Objects Conservator
> North Carolina Museum of [log in to unmask]
>