The blanket mine slept on at Battersea still smells like cat even after a wash. She ignored it as soon as she got here and had duvets to sleep on though so I've no idea if the washing would have bothered her.
I'd say a coldish wash with non bio washing powder (or no washing powder) would be your best bet for keeping the familiar smells on it.
Good idea, QueenStromba, I will do it without any washing liquid and see if it actually looks any cleaner! Catneuterer, it is v cute but I am nervous about outing myself. She does seem to have quite an intense relationship with her teddy. When she wants to go to sleep she gets into her bed, takes him in her mouth and kneads him, purring loudly. After doing this for a bit she will then settle down to sleep. Do other cats do this? Is he her mum??
Seniorboy has a number of small teddies and they're all washed very regularly because he has the delightful habit of 'dipping' them in his food bowl and then chewing them. If they weren't washed they'd be manky.
In a soft wash, dry in an hour or two and it doesn't seem to affect their appeal at all.