Ho can I clean old (non-existing) queue items?

Hi to everybody.

We have a drone-server with 3 drone-runner-docker agents working on a swarm cluster.

We can see queue items running on non existing machines ( old containers) , How can I clean the queue?

[email protected]:~$ drone queue ls 
item #2554 
Status: running
Machine: 093a0137b5d1
OS: linux
Arch: amd64
Variant: 
Version: 

item #7912 
Status: running
Machine: 7eab5d25d183
OS: linux
Arch: amd64
Variant: 
Version: 

item #7913 
Status: running
Machine: 26a956dbe289
OS: linux
Arch: amd64
Variant: 
Version: 

item #7914 
Status: running
Machine: 70b0b9f1f28c
OS: linux
Arch: amd64
Variant: 
Version: 

item #7915 
Status: running
Machine: 70b0b9f1f28c
OS: linux
Arch: amd64
Variant: 
Version: 

item #7916 
Status: running
Machine: 7eab5d25d183
OS: linux
Arch: amd64
Variant: 
Version: 

item #7917 
Status: running
Machine: 26a956dbe289
OS: linux
Arch: amd64
Variant: 
Version: 

item #8100 
Status: running
Machine: 0d9574b3d6ab
OS: linux
Arch: amd64
Variant: 
Version: 

item #8101 
Status: running
Machine: 3b95597539dc
OS: linux
Arch: amd64
Variant: 
Version: 

item #8104 
Status: running
Machine: 3b95597539dc
OS: linux
Arch: amd64
Variant: 
Version: 

item #8105 
Status: running
Machine: 0d9574b3d6ab
OS: linux
Arch: amd64
Variant: 
Version: 

item #27260 
Status: running
Machine: 9b7429edb71f
OS: linux
Arch: amd64
Variant: 
Version: 

item #27265 
Status: running
Machine: 9b7429edb71f
OS: linux
Arch: amd64
Variant: 
Version: 

item #27471 
Status: running
Machine: d5c491c602d4
OS: linux
Arch: amd64
Variant: 
Version: 

item #27481 
Status: running
Machine: d5c491c602d4
OS: linux
Arch: amd64
Variant: 
Version: 

item #27484 
Status: running
Machine: 2c0bb404e3bb
OS: linux
Arch: amd64
Variant: 
Version: 

item #27485 
Status: running
Machine: d5c491c602d4
OS: linux
Arch: amd64
Variant: 
Version: 

item #27486 
Status: running
Machine: 815b070bcea5
OS: linux
Arch: amd64
Variant: 
Version: 

item #29276 
Status: pending
Machine: 815b070bcea5
OS: linux
Arch: amd64
Variant: 
Version: 

item #29281 
Status: pending
Machine: 1568e2496d94
OS: linux
Arch: amd64
Variant: 
Version: 

item #29292 
Status: pending
Machine: 1568e2496d94
OS: linux
Arch: amd64
Variant: 
Version: 

item #31052 
Status: running
Machine: cf778c759744
OS: linux
Arch: amd64
Variant: 
Version: 

item #31095 
Status: running
Machine: 6a49e2a6dbdb
OS: linux
Arch: amd64
Variant: 
Version: 

item #31108 
Status: running
Machine: 771c3010e797
OS: linux
Arch: amd64
Variant: 
Version: 

item #31295 
Status: running
Machine: 815b070bcea5
OS: linux
Arch: amd64
Variant: 
Version: