Not enough info to answer question... "bibliography/link recommendation?", I do not think so as this is related to training in performing chromatography.
In general, you select a wash solution based on what YOU are using in your system. The "wash" solution must be fully soluble with all samples being injected and any/all buffers used. The "wash" solution should have some organic content to inhibit the growth of undesirable bugs too. You may need more than one wash solution to do the job (and that is OK). Don't forget the column too! You need to develop proper column wash solution which can be run after each method to both reduce any buildup and rinse them for use. Do not incorporate 'column wash' steps into your analytical method (novice mistake). Instead, use separate column wash methods which can be linked to the analysis method. This provides more flexibility in how they are used and is just better procedure overall.
Lastly, you should be washing the entire HPLC system flow path down with the wash solution(s), pure water and some organic at the end of each day to remove any remaining "stuff" (that is a technical term) from the system and leave it in a solution which has at least 20% organic content (again, depends on the methods you use, but perhaps 50/50 MeOH/Water).