Misc vintage japanese semihollow body, 12” radius tele neck, half tele bridge with brass saddles, single Fender p-90, custom acrylic pickguard, matte sunset pink paint, hipshot barrel tuners, synthetic bone nut
In theory, should be OK on day 1:
PETG has a Heat Deflection Temperature (HDT) of around 70°C.
Dishwasher temperatures typically range from 49-66°C during the wash cycle and 60-68°C during the rinse cycle.
Additives may make a significant difference here.