probably being a kegger and not bottling a lot these days (only 3-4 from the dregs of the batch and filtered for comps) i will shed a few words of wisdom, especially if you move to kegging and only bottle handfuls.
- dont faff about with bottle relics your grandpappy dug up from under the house, the time you spent cleaning a dozen of them you could have brewed 3 batches of all grain. trust me i know. send them back to where they came from, landfill or antiques roadshow if they are really that old.
- do all bottles in one batch in one big massive soak. my weapon of choice is nappisan or PBW if its beer related gunk (typically if its old bottles its dust, and bug grime/gunk). Again, if the bottles need a lot of scrubbing and elbow grease, turf em. i found the ones that required the most effort and ended up looking clean i still ended up with some bottle infections.
- the more cleaning you have todo, the greater the chance of it causing an infection. Again, toss it. If you have a source thats willing to drink longnecks for a month for you you will make them up quick smart.
- once cleaned do a bulk rinse in the laundry sink full of water. simple, effective, minimal residue and doesnt waste water.
- sanitisation time. we have two options starsan or iodophor, you have to dump just enough into each bottle for it to be coated in foam, you then have to somehow get the foam out of the bottle. easy for PET, a PITA for glass. leaving overnight is only the real solution, then you
can end up with dust and wild yeast inside bottles partially negating the sanitisng effect.
- my choice for glass is sterilising by baking. Easy, effortless and no wrinkly grandma fingers and a sore back from sanitising a few dozen bottles.
Once the bottles have been cleaned and dried, cap each one with alfoil and bake in the oven starting them in the COLD oven, set your temp, bake and then allowing to cool in the oven overnight with the door closed. if you open the door stright avter and try and handle them you can cause the glass to explode... this bad for obvious reasons. Baking bottles correctly will give better results than sanitising. after all they are sterilised.*
* im not going to give out info how to bake bottles for sterilisation as i dont want to kill anyone or their children with exploding bottles, i do know ThirstyBoy had a write up over this process however.