Supplies:
Sponges
Water
A cushion
The grout they had calls for it to be mixed, then set for 10 minutes and be mixed again before using.
After that they went on cleaning the pebbles.
She had to wipe each item 2-3 times to remove the grit.
The woman let them dry completely between wiping sessions.
Also she sprayed the finished pieces with Krylon Clear coat for some protection from the elements.