I wouldn't put fresh plugs in after a soak - good chance a chunk of deposit will flake off and fould a plug or stick on a valve seat. If you really want to soak, id put the old plugs back for a couple days of blasting then carefull ( cleanly) install the new plugs.
Edited by ARCOgraphite (06/08/18 08:49 AM)
2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter