Historical clue formulations

• Encrusted — 2021-12-12
• Like dry mud on a dog's paws — 2021-09-25
• Encrusted — 2020-10-23
• Like dry, clumpy mud — 2017-10-23
• Solidified — 2010-10-15
• Like dry mud on cleats — 2009-11-10
• Like thick, dry mud — 2004-11-08
• Encrusted — 1997-06-06