Well I have an...Inspiron 15 5567 and suggest me the thermal grease need to be applied as its cooling capacity has been decreased...
Arctic Silver is the most often used/suggested brand of thermal paste.
I use it on my own builds and it has reduced the CPU temp by several degrees.
Arctic Silver also sells a cleaning kit to safely clean off the old thermal paste from the CPU and heatsink and prepare the surfaces for the new thermal paste.
Dell forum member since 2002
Dell Inspiron 15 Gaming 5577 Laptop
Home Built Desktop PC with Gigabyte Designare Z390, i9 9900K CPU
Windows 11 64 bit Pro SSD drives. Cakewalk by BandLab and Studio One 4.6 Pro Recording Studio Software, MOTU Ultralite MK5 recording interface unit.
Dell S2719DGF Monitor