Sprint Fuel Tank Clean Or Renew ?

Just got my manual fan switch sorted out and decided to go for a run , I started the bike whilst pulling my leathers on and it just stopped and would not restart ....after checking as much as I could I emptied some fuel out of the carbs and it has tiny bits of crud and red spots in the fuel , will i clean the tank and if so what is the best way or just replace ? will the carbs have to come off to be cleaned too?
thank you all in advance

U{DATE !! Ii have emptied the tank and the fuel was red in colour with lots of tiny particles , should I just get another tank or clean this one ?

 

Thanks for the link,I have ordered two ,one for each line and I will line the inside , I kinda thought the carbs would need cleaned , nightmare for my non mechanic skillset ......dealer methinks