Washing bottles in dishwasher

I'm sick of washing bottles by hand. I usually leave it until the end of the day because I dread it and then it's such a chore washing up 8-9 bottles. We have the mam ones too which have 6 parts. I tried doing them in the dishwasher once but the pieces are so light they ended up strewn around and full of water. Does anyone have any tips to make this chore any easier? Sterilising them is fine it's just the physical washing up part I hate.