Hotel soap/shampoo is usually fine for hand washing small items too. Just let it soak for a little while in the sink, and then knead.

I'd add another, favor darks over white and bright colors, they'll show dirt less and dry more quickly in the sun.

From Italy:

I agree, social media is a powerful tool for companies to use to connect with their customers or users. This tip can be useful even if the company does have a strong social media presence, maybe you need a really fast answer or they just haven't gotten to your question in a while.