These prayers, or part of them, are chanted by pujaris after any altar service. They make very nice prayers to remember before bedtime, too. From the ISKCON Deity Worship Handbook:
mantra-hinam kriyä-hinam bhakti-hinam janärdana
yat püjitam mayä deva paripürnam tad astu me
O my Lord, O Janärdana, whatever little püjä 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-mätrena patram puspam phalam jalam
äveditam nivedyan tu tad grhänänukampayä
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 kincid upapäditam
kriyä-mantra-vihinam vä tat sarvam ksantum arhasi
Whatever has happened without the proper chanting of the mantra, or without following the proper procedure, kindly forgive all that.
ajnänäd athavä jnänäd asubham yan mayä krtam
ksantum arhasi tat sarvam däsyenaiva grhäna mäm
Whatever inauspicious things I have done out of ignorance or unknowingly, please forgive that, and accept me as Your insignificant servant.
sthitih sevä gatir yäträ smrtis cintä stutir vacah
bhüyät sarvätmanä visno madiyam tvayi cestitam
Let my normal condition be service, let my movement be holy pilgrimage, let my thought be remembrance of You, let my words be glorification of You. O Visnu, let my activities, with my whole mind, body and soul, be engaged in You.
aparädha-sahasräni kriyante 'har-nisam mayä
däso 'ham iti mäm matvä ksamasva madhusüdana
Thousands of offenses are performed by me day and night. But thinking of me as Your servant, kindly forgive those, O Madhusüdana.
pratijnä tava govinda na me bhaktah pranasyati
iti samsmrtya samsmrtya pränän sandhärayämy aham
O Govinda, Your promise is that Your devotee will never perish. By remembering this over and over again, I am able to retain my life-airs.
mantra-hinam kriyä-hinam bhakti-hinam janärdana
yat püjitam mayä deva paripürnam tad astu me
O my Lord, O Janärdana, whatever little püjä 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-mätrena patram puspam phalam jalam
äveditam nivedyan tu tad grhänänukampayä
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 kincid upapäditam
kriyä-mantra-vihinam vä tat sarvam ksantum arhasi
Whatever has happened without the proper chanting of the mantra, or without following the proper procedure, kindly forgive all that.
ajnänäd athavä jnänäd asubham yan mayä krtam
ksantum arhasi tat sarvam däsyenaiva grhäna mäm
Whatever inauspicious things I have done out of ignorance or unknowingly, please forgive that, and accept me as Your insignificant servant.
sthitih sevä gatir yäträ smrtis cintä stutir vacah
bhüyät sarvätmanä visno madiyam tvayi cestitam
Let my normal condition be service, let my movement be holy pilgrimage, let my thought be remembrance of You, let my words be glorification of You. O Visnu, let my activities, with my whole mind, body and soul, be engaged in You.
aparädha-sahasräni kriyante 'har-nisam mayä
däso 'ham iti mäm matvä ksamasva madhusüdana
Thousands of offenses are performed by me day and night. But thinking of me as Your servant, kindly forgive those, O Madhusüdana.
pratijnä tava govinda na me bhaktah pranasyati
iti samsmrtya samsmrtya pränän sandhärayämy aham
O Govinda, Your promise is that Your devotee will never perish. By remembering this over and over again, I am able to retain my life-airs.