While the shower may get the bike nice and clean, be careful with high water pressure around the bearings. Even "sealed" bearing are not impervious to water at pressure. And check that water is not getting inside your frame tubes. Try pulling out the seat post after a shower to check for internal moisture. Maybe it's fine, but would be good to know for sure.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72