Water is the solvent.
it would depend on the objects chemical compound structure like aluminum can be retreaved under water and salt too from evaporation.
by the pelformane of the substance
Examples: sodium chloride, hydrochloric acid, potassium dichromate, uranyle nitrate, calcium nitrate, lithium chloride, citric acid, sugar, etc. In general terms, salts, acids and bases.
Powders like sugar, salt, baking soda, etc.