Typically all pooja vidhanas end with this aparadha shodhana. This is basically to gwt rid of all offences unknowingly caused by us in the pooja, mantra, neivedhyam, etc
Sri Aparadha-shodhana
mantra-hinam kriya-hinam bhakti-hinam janardana
yat pujitam maya deva paripurnam tad astu me
Meaning: O my Lord, O Janardana, whatever little puja or worship that has been performed by me, although it is without devotion, without proper mantras, and without the proper performance, please let that become complete.
yad-dattam bhakti-matrena patram puspam phalam jalam
aveditam nivedyan tu tad grihananukampaya
Meaning: Whatever has been offered with devotion–the leaf, the flower, the water, the fruit, the food offering–please accept it out of Your causeless mercy.
vidhi-hinam mantra-hinam yat kiñcad upapaditam
kirya-mantra-vihinam va tat sarvam kshantum arhasi
Meaning: Whatever has happened without the proper chanting of the mantra, or without following the proper procedure, kindly forgive all that.
aparadha-sahasrani kriyante ‘har-nisham maya
daso ‘ham iti mam matva kshamasva madhusudana
Meaning:Thousands of offenses are performed by me day and night. But thinking of me as Your servance, kindly forgive those, O Mashusu
Madhwa 
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