Whats the du'a you say after doing Wudu which opens up the gates of heaven?

Whats the du'a you say after doing Wudu which opens up the gates of heaven?
english transliteration:
"ash-hadu an-laa ilaaha illallahu wahdahu laa shareeka lahu wa ash-hadu anna muhammadan 'abduhu wa rasooluhu"
IMHO
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