I love upcycling glass bottles for crafts like this. Some of them are too pretty to be sent for recycling so I have a cupboard in the kitchen filled bottles, all sorts of shapes, sizes, and colors, rotating them around the house as decor items. They cost me close to nothing, but glass bottles make the easiest living space update. Just gather a few bottles in different designs, insert some foraged leaves/flowers, and voila: an instant table centerpiece. It works every time, brightening up a boring corner, even if you only have space for one.
But the glass bottles need to be sparkling clean, especially the clear ones, like this packaging bottle from Clarins, which I later upcycled it into a reed diffuser, perfect due to its really narrow neck. I have since converted to DIY pink salt+dried lavender potpourri temporarily and this is sitting somewhere in the cupboard.
If you use reed diffuser at home, you will notice that after all the liquid has evaporated, a ring of grease is left behind by the carrier oil and essential oil combo that are mixed to form room fragrance diffuser. The small neck of this container makes it almost impossible to clean the stain. So when it is time for me to reuse this bottle, I have to find a way to get rid of the yellowish oil stain.
Fortunately, alcohol does the trick, and almost effortlessly.
Simply pour a thin layer of alcohol ( I use methylated spirit), swirl it around the bottle, shaking things up inside a bit, and straight away, you notice the oil are being dissolved instantly. If there are any more stubborn stains, insert a used reed stick into the bottle, and scrub on them, this will usually do remove the last bit of the remaining stains.
Discard the alcohol, and leave the bottle to air dry. I don’t rinse the bottle so that no watermark stains will be left behind after drying. Alcohol disinfects the bottle more effectively than water, so I see no reason why I should double rinse the bottle.
One more thing, this method is for cleaning/disinfecting bottles meant for crafting and decorating projects, not for sterilizing bottles/jars for food. Boiling them is the tried and true method when it comes to canning food.