Temps reaching 100° C while playing fortnite

I regret buying hp victus 15 , because how bad it is performaning just after 2 months of usage , my device is thermal throttling reaching 100°C ,not giving good fps whats not , please guys help I am just sad that after spending so much money than not getting the exact performance is just plain sad, even the hp customer care is sh*t and my fan vents are little yellowish right now how to clean it without opening it . Please help me to atleast use this laptop for 2 year atmost which is highly unlikely.