A process for manufacturing printed circuits provided with through holes, which comprises a cleaning pretreatment including a possible treatment by an organic solvent, a treatment in an alcaline solution of permanganate and a treatment for permanganate reduction, and a subsequent metallization treatment including a treatment for conditioning the walls of the through holes, a treatment for mordanting the copper surfaces, a precatalysis treatment, a catalysis treatment and a metallization treatment by a chemical copper both, wherein three treatments, namely reducing the permanganate, conditioning the walls of the through holes and mordanting the copper surfaces, are performed in a single step. The treatment for conditioning the walls of the through holes is performed by means of non-surfactant, water soluble polymers belonging to the group of the cationic polyelectrolytes. The composition for carrying out three treatments in a single step comprises an acid, hydrogen peroxide, a stabilizer for the hydrogen peroxide and a non-surfactant conditioner belonging to the group of the cationic polyelectrolytes.

Nonaqueous detergent compositions which are in the form of a liquid, paste or gel, wherein the compositions comprise a divalent and/or trivalent metal salt bleach activator are disclosed.

A thickened aqueous abrasive scouring cleanser containing bleach which is capable of stably suspending abrasives, has excellent bleach half-life stability, little or no syneresis and maintains these advantages over extended times and at elevated temperatures and comprises, in aqueous solution: (a) a colloidal aluminum oxide thickener having average particle size of no greater than about one micron; (b) at least one surfactant which can, in association with the aluminum oxide, provide proper rheology and cleaning; (c) an electrolyte/buffer to promote the environment in which the aluminum oxide and surfactant can associate to provide proper rheology; (d) a halogen bleach; (e) a particulate abrasive having average particle size of about 40 to 800 microns to provide scouring action; and (f) a phase stabilizing amount of a multivalent metal salt of a C.sub.16-22 fatty acid.

A phosphate-free mildly alkaline, dishwashing detergent composition containing: (a) from 20 to 60% by weight of sodium citrate; (b) from 5 to 50% by weight of alkali metal hydrogen carbonate; (c) from 7 to 12% by weight of alkali metal carbonate; (d) from 2 to 20% by weight of a bleaching agent; (e) from 1 to 8% by weight of a bleaching agent activator; and (f) from 0.2 to 4% by weight of an enzyme, all weights being based on the weight of the composition wherein the composition in the form of a 1% by weight aqueous solution has a pH value of from about 8 to less than 10.

A thickened aqueous abrasive scouring cleanser containing bleach which is capable of stably suspending abrasives, has excellent bleach half-life stability, little or no syneresis and maintains these advantages over extended times and at elevated temperatures and comprises, in aqueous solution: (a) a colloidal aluminum oxide thickener having average particle size of no greater than about one micron; (b) at least one surfactant which can, in association with the aluminum oxide, provide proper rheology and cleaning; (c) an electrolyte/buffer to promote the environment in which the aluminum oxide and surfactant can associate to provide proper rheology; (d) a halogen bleach; (e) a particulate abrasive having average particle size of about 40 to 800 microns to provide scouring action; and (f) a viscosity stabilizing amount of a multivalent metal salt.