ball death is the subject of great debate
imo........the ball doesn't die ( unless you kill it )
the covers of today absorb oil at a great rate, and the covers become saturated w/ oil causing them to loose reaction, and possibly hitting power.
there are several ways to extract the oil in the cover, and just like magic your old baby is back and good as new.
if you look at manufactures suggestions they have recommendations as to how often this should be done, and a lot depends on you and how much oil you see.
some balls absorb at much higher rates than others
think of it as an oil sponge
oil extraction methods used by yours truly
dishwasher ( my fav )
hair dryer ( works in a pinch )
sunbathing ( very effective in summer, not so good in winter )
pro shop rejuvenating machine ( preferred method of house hacks all across the land, but its not cheap imo to have this done, and i'd rather do things myself )
other methods not used ( nor will i ever )
oven baking ( im not sticking my balls in the oven. )
hot water method ( too labor intensive for me )