How much do you think these vintage dairy bottles are worth?

Question:I have one that is a Highland Farms Dairy, Washington, D.C. 1 quart glass bottle with green writing on it. It has a woman serving food and says, "More Milk, Better Dishes, Greater Economy" and on the other side has a picture of a farm with "Highland Dairy Farms, Washington, D.C. on it. The other one is a Pet Dairy Products Co. half pint dairy jar, is glass has red writing on it with a picture of two men in a lab and says"Laboratory Controlled" on one side in red and Pet Dairy Products Co. on the other side in red. We found these at my grandmother's house way back in the basement buried up in the corner in some dirt, because this house we were renovating it, because it was an old farmhouse. Any and all honest and truthful answers would be greatly appreciated. Thanks

Answers:
Sorry to be blunt but like any collectable, they are worth what someone is willing to pay... regardless of any price guide that may be out there. Condition and rarity are very important to collectors. Until you know what you have, do NOT put them in a dishwasher... the modern soaps can etch the glass and remove the old paint.

Do some searching on eBay for both open and closed auctions to see if there is anything similar for reference.