Answered by Shaykh Ilyas Patel
After reading Janaza namaz, are we supposed to have a shower or bath and change our clothes? Is there any thing like that in fiqh?
Allama Hasan Shurunbulali states in his excellent Maraqi’l-Falah as follows:
“It is praiseworthy [but not obligatory] to take a bath in sixteen circumstances:
 after washing a dead body, to take one out of the differences of opinion who necessitate taking a bath after washing the deceased.”
(Allama Hasan Shurunbulali, Maraqi’l-Falah pg 86)
Also wudhu is praiseworthy as is mentioned by Allama Shurubulali in Maraqi’l-Falah as follows:
“Wudhu is of three kinds: compulsory, necessary and praiseworthy.
Third, when wudhu is praiseworthy
after washing the deceased and carrying a dead body. The Prophet (Allah bless him and give him peace) said, whoever washes the deceased, let him take a bath and whoever carries it let him do wudhu.’
(Allama Hasan Shurunbulali, Maraqi’l-Falah pg 67)