Swami,
Why kshavaram not to be done on Saturday and Sunday?
Adiyen
https://www.kinchit.org/dharma-sandeha/thread/kshavara-nishedam/
Swami,
In the above link Velukkudi Swami has elucidated nicely. It could be helpful to you though we don’t know why it is prohibited on certain tithis / days.
But Sundays are not prohibited days for ‘Sarvaanga Kshavaram’.
– Adiyen