Answered by Shaykh Yūsuf Badāt
My question is, would my du’a’ (supplication) after khatmul-Qur’ān (Qur’anic completion) still be accepted if my wuḍū (ablution) was not valid?
I have completed the Qur’ān at least 3 times after which I made a special du’ā’ (after each completion), hoping for it to be accepted. However, recently, I have realized that all this time my istibrā (cleaning after washroom) method had been ineffective and urine drops continued to fall even after ablution.
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of Allāh, Most Gracious, Most Merciful.
Jazāk Allāh Khayr/ Thank you for contacting Mathābah.
Your du’ā after the completion of the Qur’ān is In-shā Allāh accepted. Ablution (wuḍū) is not a condition or requirement for its validity.
“And your Lord says, “Call upon Me; I will respond to you.” – (Qur’ān 40:60)
Only Allāh knows best.
 وَقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ – غافر ٦٠