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Why do you feel the need to wash them at all? Even with machine washable sleeping bags, repeated washing ruins them over time. It's not generally recommended to wash sleeping bags any more than absolutely necessary.  Use a liner and you almost never have to do it,  not unless something gets spilled on them or (kids only!) someone has an accident. Otherwise they do perfectly well if you hang them up to air between trips.

I would strongly emphasise Vals comments above.  I have wasted lots of money over the years on sleeping bags. Mainly because I have been too tight to buy liners.  Some bags wash better than others but I have never had one that was as good after a wash. 

I now have liners from cotton through fleece to the warmest silk.  I find with these and a light 2 season and/or a good 3 season bag, there is not a weather condition in England I couldn't comfortably sleep in provided I had wind and rain shelter from a tarp.  Trouble is... It's cost me more in liners than for both bags!

Any are good, the main things are breathability and ease of washing.  I am partial to a flannelette sheet myself.  :)  They can get as expensive as a bag itself but if your bag is warm enough for the conditions you face the old YHA style cotton sheet ones are as good as anything.  For the space they take up though, a warm fleece one can be a blessing if needed on those unexpectedly cold nights.  Easy to make from a cheep fleece throw I should think.  I never use heating in a tent unless someone else J insists.  I consider camping an outdoor activity and if I felt the need for heating during the night, I would not have got the right sleeping bag setup.

btw, I didn't mean to suggest that washing a bag was out of the question, just that, as Val said, absolutely minimum and as gentle as you can.

i made my sleeping bag lines from fleece blankets from ikea cost me £1.60 for each blanket.

also if you bag is dirty putting it into a washing machine on a delicate wash or hand wash if you machine has that cycle and a slow spin should suffice. my lightweight bag is a hand wash only and was fine on a slow hand wash in the machine.