Optimization of a procedure for allergen control on surfaces by combination of a swabbing method and two immunochemical tests. Selection of swab material and extraction buffers influence the recovery of egg and milk residues. Swabbing method should be adapted to the kind of surface and the detection method. Quantitative ELISA method can be used for the validation of cleaning procedures in food industry facilities. Qualitative lateral flow test is an easy and suitable method for routine verification of cleaning effectiveness.