well cleaning chemfuel puddles is vanilla rimworld, so that wouldn't be to do with rimefeller, i only add napalm trails and oil spills

its a droplet icon that came out of a rimefellar pipe, so I only assumed that it was part of the mod not the game. sorry

not sure how much you trust imgur, but here's a picture of what I'm dealing with. https://imgur.com/a/YlTi87Z

a droplet icon that came out of a rimefeller pipe? never heard of that before, are you using any mods that mod my mod, is it something like that hk mod that takes copies of my mods and does their own things with it?

I don't believe that I am using a mod to mod your mod, but just in case i'm wrong here's my mod list:
+Harmony
+Core
+Turret Collection
+Adjustable Trade Ship
+Upgradeable Weapons
+Psitech
+Industrial Rollers
+Outdoor Lighting
+Advanced Power Generation
+Misc. Robots
+GF Girls Frontline
+Rico Fox's Combat tweaks
+Better Cannons
+HugsLib
+JecsTools
+Doors Expanded
+Damage Indicators
+Rah's Bionic and Surgery Expansion
+RimFridge
+Mass Effect Guns
+Halo UNSC Weapon Pack
+HALO: Rimworld Auxillery
+HALO: Rimworld Shield Sound Replacer
+Starwars - The Force
+Starwars - Fully Functional Lightsabers
+CM Color Coded Mood Bar
+Starwars Animal Collection
+Resource Replicator
+Craftable Plasteel
+Fallout Traits (Continued)
+Component Plant
+Level Up!
+Archotech+
+Toolbox
+More Linkables
+Super Multi-Analyzer
+EdB Prepare Carefully
+Ra2Bunker
+Ra2Bunker SC2 Addon
+NeotokyoMusic
+Realistic Darkness
+Miningco. Mining helmet
+Mines
+Chatting On Comms
+Interaction Bubbles
+Simply More Bridges (Continued)
+Military Furniture
+Rimworld Spartan Foundry
+Rimsenal Core
+Humanoid Alien Races 2.0
+Rimworld Colonies Evolved
+SpecialWeapons
+The Zerg!
+Astra Militarum Imperial Guard Core Mod v2.07
+Astra Militarum Imperial Guard Turret Addon Mod v2.0
+Show Hair with Hats
+SRTS Expanded
+Wall Light
+RimHUD
+RPG Style Inventory
+A Rimworld of Magic
+More Mechanoids
+Jewelry
+Cybernetic Organism
+Expanded Prosthetics and Organ Engineering
+Vanilla Armor Expanded
+Polarisbloc - Core LAB
+Polarisbloc - Security Force
+Vanilla Furniture Expanded
+Powered Floor Panels
+Gloomy Furniture
+The Brotherhood Compendium
+Rimwriter - Books, Scrolls, and Tablets
+Squad UI Tweaks
+Statue of Colonist
+Deep Stack
+Hospitality
+RimThemes
+Stellaris Theme
+More Sculpture
+Maid Project
+Rimmu-Nation Clothing
+Map Reroll
+Cybernetic Storm
+Polyamory Beds (Vanilla Edition)
+Same Spot
+Hats Display Section
+Female BB BodyType Support
+Kijin Race 2.0
+Simply More Floors
+Zeta Reticulans
+Medical IV's
+Colony Leadership
+Glitternet
+Supply and Demand
+Mechalit Core 1.1
+Rejuvenate Surgery
+Forsakens
+Raids For Me
+Minify Everything
+Home Mover
+Utility Comms
+Psychology (Unofficial)
+Yuudai1998's Chibi Face
+Spoons Hair Mod
+Gradient Hair
+Hair Dye
+Vee Hairs
+Vanilla Weapons Expanded - Laser
+Vanilla Animals Expanded - Ice Sheet
+Vanilla Animals Expanded - Tropical Rainforest
+Vanilla Animals Expanded - Tropical Swamp
+Vanilla Animals Expanded - Boreal Forest
+Vanilla Weapons Expanded - Quickdraw
+Vanilla Hair Expanded
+Vanilla Furniture Expanded - Security Module
+Powerful Faction Bases
+Large Faction Bases
+Bioreactor
+Trade Ships Drop Spot
+Jin-Roh Kerberos Panzer Cop Armor (Continued)
+Vanilla Furniture Expanded - Medical Furniture
+Sci-Fi Power Core
+Rimsearch
+Rimmu-Nation Security
+Radiology
+Rimmefeller
+Rimatomics
+Glowstone
+Gemstones
+Removes Skill Decay
+Research Pal
+Dubs Mint Menus
+UnderWhere
+DE Surgeries Color
+The Forge - Anvil
+Havoc Squad - Trooper
+Halo Heretic Mechanoids
+Project Rimfactory Reloaded
+Rimmefeller Automated Autoclave
+Megafauna
+Beam Me Up Scotty
+Armor Racks
+Less Rebuff
+Priority Treatment
+Various Space Ship Chunk (Continued)
+Skilled Stonecutting
+Electric Stonecutting Table
+Bulk Stonecutting
+Bionic Icons
+Gunplay
+The Wasteland Compendium
+The Brotherhood Compendium - Gunplay Addon
+OniOST
+Space Western (music pack)
+Music On the Rim
+P-Music
+Custom Music
+Rimwave Music
+Time-Based Dangers
+Hotkeys
+Archotech Expanded
+Archotech Expanded Prosthetics
+Mechanoid Bench
+Etched Stone Walls (Continued)
+Pawn Target Fix
+Replimat
+CleaningStation
+Dubs Performance Analyzer
+No Healing Emotes
+No Random Relations
+No Shadows (Continued)
+No ZzZ
+RimPy Mod Manager Database
+Silent Doors (Continued)
+Single Plant Texture Patch
+Silent Jungle Insects
+No Debris 1.1
+Mod Manager
+JobsLimitTweak
+Animals Logic
+Locks (DoorsExpanded)
+ED-EnhancedOptions
+Invisible Conduits 1.1
+Graphic Settings
+FrameRateControl
+NoMote
+Change Map Edge Limit
+Lag Free Lamps
+Prosthetic No Missing Bodyparts
+No Random Construction Quality
+Astra Militarum Imperial Guard ServoSkull Addon Mod v1.1
+Faction Control 1.1
+MedPod

I think I just confirmed that this is rimefeller thats doing this, because once I uninstalled the mod, the droplet disappeared.

well normally you dont just get oil drop designators appear unless you manually designated them, so you would have to have had a spill of oil, designated it to be cleaned up, then a pawn would come along and do the job

I've had this issue in a previous game. There was one droplet marker that could not be cleaned, and random colonists assigned to cleaning would focus their entire work period on trying to do so. Pretty sure this was after I had deconstructed oil wells and heads. I was moving that base. I eventually god-mode built 9x9 wall cells over and around it so it was unaccessible. I can't recall for sure if I had tried using the dev-tool clan operation, but I believe I did and it didn't work. Have played with Rimefeller installed for a long time and only seen this once about a month ago.