The most convenient option is to avail of public facilities in a bar or café; it’s customary, though not mandatory, to consume in order to pay for their services.
Most hotel lobbies and public rooms also have excellent bathroom facilities. The cleanliness of the establishment is a good indication of the condition of their toilets.
Petrol stations are fitted out with bathrooms, at times, though, you will have to ask staff for the key.
Department stores such as El Corte Inglés or FNAC are also well equipped with bathrooms.
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