Stain removal through novel oxidizer and chelant combination

A method of using a detergent composition comprising:

• providing a warewashing detergent composition comprising:
• alkali metal carbonate
• as a chelant methylglycinediacetic acid and optionally glutamic acid diacetic acid and/or alkali metal tripolyphosphate,
• alkali metal percarbonate, and
• a peroxidation catalyst according to the formula
• wherein:
• L1 and L2 can either be separate ligands or can combine to be a single molecule, each L independently is an organic ligand containing at least three nitrogen atoms that coordinate with the metal M;
• M is Mn or Fe;
• each X independently is a coordinating or bridging group selected from the group consisting of H2O, OH−, SH−, HO2−, O2−, O22−, S2−, F−, Cl−, Br−, I−, NO3−, NO2−, SO42−, SO32−, PO43−, N3−, CN−, NR3, NCS−, RCN, RS−, RCO2−, RO−, and
• with R being hydrogen or a C1 to C6 alkyl group;
• Y is a counter ion;
• wherein the molar ratio of chelant to alkali metal percarbonate is in the range of 1.8 to 3.4;
• wherein said molar ratio is calculated based on the total molar amount of methylglycinediacetic acid, glutamic acid N,N-diacetic acid, and alkali metal tripolyphosphate;
• wherein for the purpose of calculating said molar ratio alkali metal percarbonate is assumed to have the formula 2(M2CO3)·3H2O2, where M represents an alkali metal;
• and
• wherein the total amount of methylglycine diacetic acid, glutamic acid N,N-diacetic acid and alkali metal tripolyphosphate is not more than 35% by weight;
• and removing tea and coffee soil.