Also depends on what you’re trying to clean…someone mentioned Larq, which is great for bacteria, etc.

But won’t do anything for hard water or even coffee residue.

If you are having residue from other liquids, they have these tablets you can drop in your bottle to clean them or you can use baking soda and vinegar (like grade school science projects). They also sell bottle brushes that fit into the small opening but still scrub the sides and bottoms real well.

But all the widemouthed and insulated options from the other comments are fantastic as well, just wanted to throw in some solutions if you wanted to keep using your old gear