The present invention provides compositions, in particular blocks, tablets and gels, for the prevention or removal of insoluble salt deposits comprising: a) an organic acid with two carboxylic acid functional groups obtainable by fermentation, selected from the list of itaconic acid, itaconic acid anhydride, succinic acid, succinic anhydride and combinations thereof, and b) at least one compound determining the release of said acid from said composition, said compound is selected from a list comprising: i) a hygroscopic compound, ii) a carbonate source, iii) an acid solubility retarding compound, iv) a compound with melting point situated between 60° C.-95° C., and combinations thereof. The invention further provides uses of the compositions for the prevention or removal of insoluble salt deposits. The invention also provides a method of manufacturing such compositions and a method for the prevention or removal of insoluble salt deposits with a product of the invention.