Tacky handles on knives - advice please

I have a set of 5 Sabatier knives in a wood block.  The handles are black rubber with stainless steel on both sides.  The rubber bits (where you get the grip from) have gone tacky/sticky.  I have thoroughly washed them with good washing up liquid and dried, but it hasn't helped much.
Any help/advice what to try next ?   Thanks,  Mrs Bouquet

I think the answer is probably yes to all those !!!  I don't want to buy new ones, because apart from the tacky handle bit they are excellent.   So expensive as well.  I thought I woud try to rub some baking powder around them - what do you think ?  Worth ago I 'spose.  Mrs B

Some of my knives (not my posh ones) went like that, I found rubbing some veg oil in and giving them a good rub/polish up afterwards, stopped the stickiness, and haven't put them in the dishwasher since, just dipped the blades in very hot water and wiped them dry. Only takes seconds and better than buying replacements.

Would WD 40 on them clean it off?

I tried that, Snows, and it didn't seem to work with me!

(I knew there was something else I'd used, but couldn't remember what it was)!